#2123 windows (D2D): empty window when opening gnuplot hidden

[Bastian Märkisch]

This is a reminder (to myself) that when the gnuplot executable is started "hidden", the Direct2D backend of the windows terminal fails to display something.

Eli Zaretskii reports in [#2116]:

(...) Emacs on MS-Windows by default invokes console programs with the wShowWindow member of the STARTUPINFO structure set to SW_HIDE, to avoid popping up the console window of the sub-program.

And later:

if I set the terminal to "windows", the GUI window opens, but is blank. I need to click on Options and select the GDI+ backend, then the graph appears. So it looks like some problem with the Direct2D backend, which is the default.
See https://sourceforge.net/p/gnuplot/bugs/2116/#e513/8a1c

I cannot reproduce this on a Windows 10 machine yet.

[Bastian Märkisch]

Also this is potentially related to initialization issues discussed in [#2304].